Chronostratigraphic framework for the IODP Expedition 318 cores from the Wilkes Land margin; constraints for paleoceanographic reconstruction
| Online Access: |
Get full text doi: 10.1029/2012PA002308 |
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| Author(s): | Tauxe, L.; Stickley, C. E.; Sugisaki, S.; Bijl, P. K.; Bohaty, S. M.; Brinkhuis, H.; Escutia, C.; Flores, J. A.; Houben, A. J. P.; Iwai, M.; Jiménez Espejo, F.; McKay, R.; Passchier, S.; Pross, J.; Riesselman, C. R.; Röhl, U.; Sangiorgi, F.; Welsh, K.; Klaus, A.; Fehr, A.; Bendle, J. A. P.; Dunbar, R.; Gonzàlez, J.; Hayden, T.; Katsuki, K.; Olney, M. P.; Pekar, S. F.; Shrivastava, P. K.; van de Flierdt, T.; Williams, T.; Yamane, M. |
| Author Affiliation(s): |
Primary: Scripps Institution of Oceanography, San Diego, CA, United States Other: University of Tromso, Norway Utrecht University, Netherlands University of Southampton, United Kingdom Universidad de Granada, Spain Universidad de Salamanca, Spain Kochi University, Japan Victoria University of Wellington, New Zealand Montclair State University, United States University of Frankfurt, Germany U. S. Geological Survey, United States University of Bremen, Germany University of Queensland, Australia Texas A&M University, United States Rheinisch-Westfaelische Technische Hochschule Aachen, Germany University of Glasgow, United Kingdom Stanford University, United States Western Michigan University, United States Korea Institute of Geoscience and Mineral Resources, South Korea University of South Florida, United States Queens College, United States Geological Survey of India, India Imperial College London, United Kingdom Lamont-Doherty Earth Observatory, United States University of Tokyo, Japan |
| Volume Title: | Paleoceanography |
| Source: | Paleoceanography, 27(2). Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0883-8305 CODEN: POCGEP |
| Note: | In English. 35 refs.; illus., incl. sketch map |
| Summary: | The Integrated Ocean Drilling Program Expedition 318 to the Wilkes Land margin of Antarctica recovered a sedimentary succession ranging in age from lower Eocene to the Holocene. Excellent stratigraphic control is key to understanding the timing of paleoceanographic events through critical climate intervals. Drill sites recovered the lower and middle Eocene, nearly the entire Oligocene, the Miocene from about 17 Ma, the entire Pliocene and much of the Pleistocene. The paleomagnetic properties are generally suitable for magnetostratigraphic interpretation, with well-behaved demagnetization diagrams, uniform distribution of declinations, and a clear separation into two inclination modes. Although the sequences were discontinuously recovered with many gaps due to coring, and there are hiatuses from sedimentary and tectonic processes, the magnetostratigraphic patterns are in general readily interpretable. Our interpretations are integrated with the diatom, radiolarian, calcareous nannofossils and dinoflagellate cyst (dinocyst) biostratigraphy. The magnetostratigraphy significantly improves the resolution of the chronostratigraphy, particularly in intervals with poor biostratigraphic control. However, Southern Ocean records with reliable magnetostratigraphies are notably scarce, and the data reported here provide an opportunity for improved calibration of the biostratigraphic records. In particular, we provide a rare magnetostratigraphic calibration for dinocyst biostratigraphy in the Paleogene and a substantially improved diatom calibration for the Pliocene. This paper presents the stratigraphic framework for future paleoceanographic proxy records which are being developed for the Wilkes Land margin cores. It further provides tight constraints on the duration of regional hiatuses inferred from seismic surveys of the region. |
| Year of Publication: | 2012 |
| Research Program: |
IODP Integrated Ocean Drilling Program |
| Key Words: | 12 Stratigraphy, Historical Geology and Paleoecology; 20 Geophysics, Applied; Algae; Anisotropy; Antarctica; Biostratigraphy; Calibration; Cenozoic; Chronostratigraphy; Climate change; Continental margin; Demagnetization; Diatoms; Dinoflagellata; Eocene; Expedition 318; Geophysical methods; Geophysical surveys; Holocene; IODP Site U1359; IODP Site U1361; Integrated Ocean Drilling Program; Invertebrata; Magnetic declination; Magnetic inclination; Magnetic properties; Magnetic susceptibility; Magnetostratigraphy; Marine methods; Microfossils; Nannofossils; Paleo-oceanography; Paleoclimatology; Paleogene; Paleomagnetism; Palynomorphs; Plantae; Protista; Quaternary; Radiolaria; Reconstruction; Seismic methods; Seismic stratigraphy; Southern Ocean; Surveys; Tertiary; Wilkes Land |
| Coordinates: |
S663000
S631500
E1440000
E1354500 |
| Record ID: | 2013005641 |
| Copyright Information: | GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States |